Hydraulic power transmitter control



Sept. 16, 1941. F, VOSMUN 2,255,857

HYDRAULIC POWER TRANSMITTER CONTROL I Filed 00?. 4, 1938.

gwuc/wboo FEED N. OSMUN Patented Sept. 16, 1941 HYDRAULIC POWER TRANSMITTER CONTROL Fred N. Osmun, Houston, Tex.

Application October 4, 1938, Serial No. 233,173

3 Claims.

' of the parts.

The device is particularly useful when incorporated into the operating string of a pipe cutter for regulating and controlling the feed of the cutters to the work or in the operating string of rotary jars, milling tools and the like for controlling their operation in a well and in general is capable of use in connection with an operating string embodying means for controlling a hydraulic power transmitter.

With the above and other objects in view, the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawing, wherein:

Figure 1 shows a longitudinal, sectional view of the apparatus, and

Figure 2 shows a cross-sectional view taken on the line 2-2 of Figure 1.

Referring now more particularly to the drawing wherein like numerals of reference designate the same parts in each of the figures, the numeral I designates an outer tubular member, such as a drill stem to which the cutter body is attached and the numeral 2 designates an inner tubular part arranged axially with respect to the tubular member I. The member I is relatively movable and rotatable with respect to the said inner tubular part 2.

In the embodiment shown, the tubular member I is provided with the tandem cylinders 3, 4 in which is fitted the plunger 5 embodying the cup rings 6, l which open inwardly, or toward each other, and which are suitably secured around the plunger and fit closely in the respective cylinders. It will be noted that the plunger 5 forms also a coupling for connecting adjacent sections of the inner tubular part 2. The cylinder 4 is of greater transverse diameter than the cylinder 3, as illustrated in Figure 1, thus providing annular chambers, a low pressure chamber 8 and a high pressure chamber 9. There is an internal, annular channel l within the plunger which is connected with the low pressure chamber 8 through the passageway II, and which is also connected with the low pressure chamber 8a, through the passageway I'Z. As is obvious from an inspection of Figur 1, the low pressure chambers 8 and 8a are located at opposite ends of the plunger 5. Threaded through the wall of the plunger 5 there is a plug 13 having a relief passageway I' l therethrough leading from the high pressure chamber 9 into the channel I0.

Leading from the chamber 8a through the plunger into the high pressure chamber 9 there is a relatively large passageway l5 which is controlled by the back pressure valve 5 normally held seated on the seat I! by the coil spring H3.

The chambers 8, 9 and 8a and the channels, or passageways connecting them are normally filled with liquid. Upon relative movement of the parts I, 2 to decrease the capacity of the chamber 9 the liquid in said chamber will grad-- ually leak through the passageway l4 into the low pressure chamber 8a, and simultaneously as the capacity of chamber 8 is reduced, the liquid therein will flow freely into chamber 8a. The packing as I9, 20, between said relatively movable parts on opposite sides of the low pressure chambers will thus not be subjected to any considerable pressure and leakage from said low pressure chambers may thus be easily prevented, fiuid leaking from either end of the high pressure chamber 9, will be retained in the device in said low pressure chambers 8, 8a.

The rate of relative movement between the parts, in one direction, may thus be retarded and controlled in accordance with the capacity of the passageway I4. Upon relative movement of the parts in the opposite direction the liquid will quickly flow through the passageway l5 past the back pressure valve l B into the high pressure chamber 9.

When the apparatus disclosed in the drawing is embodied in a pipe cutter, the inner part 2 will be held stationary, during the operation of the cutter, by suitable grappling means which grapples the pipe to be cut and the outer part I will be moved downwardly to expand the cutters and. will rotate in the ordinary way common to pipe cutters now in common use, but the downward movement of the outer part I' will be controlled in the manner hereinabove specified. While cutting the pipe, circulation should be maintained and for that purpose the inner part 2 has been made tubular as shown.

The drawing and description disclose what is now considered to be a preferred form of the invention by way of illustration only, while the broad principle of the invention will be defined by the appended claims.

what: claim is: V

1. A'device of the character described com-,

prising an outer tubular member having closed ends which'have axially aligned holes therein, an inner tubular part reciprocable through said holes and member, packing between the ends and the tubular part, 'said outer tubular memher being of reduced transverse diameter in one portion ,thereof, aeplunger on the inner tubular part'fitted closely in the tubular, member and having one end reduced in diameter and adapted to fit closely in the portion of the tubular member having the reduced diameter, said plunger and tubular member being adapted to" form closed chambers between the ends of :the

tubularmember and the plunger and also between the plunger and the tubular member intermediate said end chambers, said device havf ing fluid conducting means connecting said 7 ducting means.

- :2. A device of the character described comprising an outer tubular member having closed ,ends which have axially aligned holes therein, an inner annular part reciprocable through said holes and membena plunger on the annular part, said device having a low pressure chamber at each end of the plunger, means including said member and plunger forming a high pressure chamber intermediate the end chambers, said device having fluid conducting means connecting said chambers through which a fluid may be conducted from the end chambers to the intermediate chamber, means .for retarding the flow of the fluid in one direction through said conducting means, and means allowing free flow of liquid in the other direction throughsaid conducting means.

3. Adevice of the character described comprising. an outer tubular member having closed ends which have axially aligned holes therein, an inner annular part reciprocable through said holes and member, a plunger on the annular part, said device having a low pressure chamber at each end of the plunger, means forming a high pressure chamber intermediate the end chambers, said device having fluid conducting means connecting said chambers through which a fluid may be conducted vfrom theend chambers to the intermediate chamber, means for retarding the flow of the fluid in one direction-through said conducting means and means allowing free flow of liquid in the other direction.

FRED N. GSMUN. 

